bgp/parser-impl/src/main/java/org/opendaylight/protocol/bgp/parser/impl/message/open/MultiProtocolCapabilityHandler.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.bgp.parser.impl.message.open;
   9
  10 import com.google.common.base.Preconditions;
  11 import io.netty.buffer.ByteBuf;
  12 import io.netty.buffer.Unpooled;
  13 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  14 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  15 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  16 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  17 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  18 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  19 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.optional.capabilities.CParameters;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.optional.capabilities.CParametersBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1Builder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.MultiprotocolCapability;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.MultiprotocolCapabilityBuilder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  28
  29 public final class MultiProtocolCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  30     public static final int CODE = 1;
  31
  32     private final AddressFamilyRegistry afiReg;
  33     private final SubsequentAddressFamilyRegistry safiReg;
  34
  35     private static final int RESERVED = 1;
  36
  37     public MultiProtocolCapabilityHandler(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  38         this.afiReg = Preconditions.checkNotNull(afiReg);
  39         this.safiReg = Preconditions.checkNotNull(safiReg);
  40     }
  41
  42     @Override
  43     public CParameters parseCapability(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
  44         final int afiVal = buffer.readUnsignedShort();
  45         final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  46         if (afi == null) {
  47             throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  48         }
  49         // skip reserved
  50         buffer.skipBytes(RESERVED);
  51         final int safiVal = buffer.readUnsignedByte();
  52         final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
  53         if (safi == null) {
  54             throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
  55         }
  56
  57         return new CParametersBuilder().addAugmentation(CParameters1.class,new CParameters1Builder().setMultiprotocolCapability(
  58             new MultiprotocolCapabilityBuilder().setAfi(afi).setSafi(safi).build()).build()).build();
  59     }
  60
  61     @Override
  62     public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
  63         if ( capability.getAugmentation(CParameters1.class) == null
  64             || capability.getAugmentation(CParameters1.class).getMultiprotocolCapability() == null ) {
  65             return;
  66         }
  67         final MultiprotocolCapability mp = capability.getAugmentation(CParameters1.class).getMultiprotocolCapability();
  68
  69         final ByteBuf capBuffer = Unpooled.buffer();
  70         final Class<? extends AddressFamily> afi = mp.getAfi();
  71         final Integer afival = this.afiReg.numberForClass(afi);
  72         Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  73         capBuffer.writeShort(afival);
  74
  75         final Class<? extends SubsequentAddressFamily> safi = mp.getSafi();
  76         final Integer safival = this.safiReg.numberForClass(safi);
  77         Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  78         capBuffer.writeZero(RESERVED);
  79         capBuffer.writeByte(safival);
  80
  81         CapabilityUtil.formatCapability(CODE, capBuffer, byteAggregator);
  82     }
  83 }